Shut-off pressure of pump

[sujins]

What is the disadvantage of running pump at shut-off head, zero flow rate?

 

[bulkhandling]

I think we've head tremondous discussion on this. Try to search past thread.
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http://www.tipmaster.com/includes/refinfo.cfm?w=450&h=450')

 

[sujins]

I can't see any information from your link. Please help answer.

 

[Bjegovic]

last time this issue was discussed in thread 'pump cavitation' started by airbus a few days ago.

 

[25362]

The discussion in your own thread407-136129 is quite explicit. Anyway quoting Sulzer on minimum (>zero) flow rates of centrifugal pumps:

Minimum flow rate of centrifugal pumps is determined by the following criteria:
-temperature rise due to internal energy loss.
-internal recirculation in the impeller (with large
impeller inlet diameter compared with outside diameter,
the NPSH rises in the part-load range).
-increased vibration due to greater flow separation.
-increased pressure fluctuation at part load.
-increased axial thrust at low flow rates.
-increased radial thrust (especially with single-volute
pumps).

Most of these conditions worsen at no flow.